Arrangement for bestowing a body with a rotary and wobbling movement



June 1, 1965 A. URBAN 3 ARRANGEMENT FOR BESTOWING A BODY WITH A ROTARY AND WOBBLING MOVEMENT Filed July 8, 1965 2 Sheets-Sheet l INVENTOR Ado/f U a AT TORNEY-S June 1, 1965 A. URBAN 3,186,243

ARRANGEMENT FOR BESTOWING A BODY WITH A ROTARY I AND WOBBLING MOVEMENT Filed July 8, 1965 2 Sheets-Sheet 2 l7 l5 I :5 7 l8 l F 20 l5 l3 U d O l6 I Fig 3 M II I. ;.u [I i ',-i T Tn '75? i T= J i1 I H mumlm INVENTOR Halo/f Urban WW-M United States Patent 3,186,243 ARRANGEMENT FOR BESTOWING A BUDY WETH A ROTARY AND WOBBLING MOVEMENT Adolf Urban, Muttenz, Switzerland, assignor t0 Willy A. Bachofen, Basel, Switzerland Filed July 8, 1963, Ser. No. 293,303 Claims priority, application Switzerland, July 13, 1962, 8,48 62 4 Claims. (Cl. 74-86) Various embodiments or arrangements for bestowing a body with a rotary and wobbling movement through the agency of a reversible kinematic chain have already been proposed, as disclosed for instance in the US. Patent No. 2,991,657. The latter patent refers to the difiiculties which have been met in the attempts made for solving the driving problems arising with such arrangements. It is true that the mechanism disclosed in said prior patent leads to ,a faultless solution of said problems, but its bulk is somewhat considerable and this is objectionable for the execution of small-sized arrangements.

My invention has now for its object an arrangement of the type referred towherein the driving problem is solved in a quite different manner and provides a driving mechanism the bulk of which is substantially reduced.

According to my invention, the arrangement bestowing a body with-a rotary and wobbling movement relies on the principles of a reversible chain and includes links pivotally secured to the body the movement of which is to be obtained, said links being connected on the other hand with auxiliary shafts driven by a driving motor through the agency of a transmission including a speed-reducing gear.

According to my invention, the speed-reducing gear includes a driving wheel fitted loose on the auxiliary shaft lying nearer the driving motor and the peripheral movement of which is transmitted on the one hand to said firstmentioned auxiliary shaft through the agency of a compensating gear carried by the same shaft and comprising rolling members held between two rings and, on the other hand, tothe other auxiliary shaft through the agency of a casing 2 into said casing so as'to carry a toothed wheel 7 meshing with a somewhat larger toothed wheel 8 carried by a further shaft 9 revolvably carried by last-mentioned transverse wall of the casing 2.

Said shaft 9 carries at its end a worm 10 meshing with a wormwheel 11 fitted loose on the auxiliary shaft 3 nearest the motor 5 (see also FIGS. 1 and 3). Above the worm 11 is located a friction roller gear constituted by a driving ring 12 and a driven ring 13 with the interposition between the two rings of a cage 15 keyed to the auxiliary shaft 3 and enclosing the balls 16 engaging frictionally the cooperating ring surfaces.

The driving ring 12 rests on a shoulder provided on the upper surface of the wormwheel 11 so as to rotate in unison with the latter while the driven ring 13 is rigid with the lower surface of a chain wheel 14 revolvably carried in its turn by the auxiliary shaft 3 with the interposition of a needle bearing. The upper end of the auxiliary shaft 3 is provided with an outer thread over which is screwed a doublenut 15; said double nut compresses the fritcional roller gear through the agency of a spring washer 17 and of a thrust bearing 18, the pressure applied being that required for the transmission of the torque of the driving ring 12 to the driven ring 13. The chain wheel 14 faces a cooperating chain wheel 19 keyed to the other auxiliary shaft 4. A link chain 2t) extends over the two chain wheels 14 and 19 to operatively interconnect chain wheel of a chain drive which is fitted loose on the first-mentioned auxiliary shaft, to be driven by the compensating gear.

I have illustrated by way of example in the accompanying drawings a preferred embodiment of the object of my invention. In said drawings:

FIG. 1 is a diagrammatic illustration of the arrangement, adapted to make its principle clearer for the reader.

FIG. 2 is a side view, partly sectional of a practical embodiment of the arrangement.

FIG. 3 is a vertical cross-section of said arrangement through line IIII1I of FIG. 2 with parts in elevation.

FIGS. 4 and 5 illustrate two structural modifications.

The arrangement according to FIG. 2 includes a hollow carrier upright 1 the lower end of which extends into a jutting out pedestal 1a. The upper end of said carrier upright 1 is rigid with an overhanging casing 2 extending in the same direction as the pedestal 1a, the Cross-section of the side walls forming said casing lying along the sides of a square. If required, the casing 2 may be adjustably fitted in any angular position to the carrier upright 1 on which it is angularly shiftable.

The associated upper and lower walls of said casing 2 are provided along the medial longitudinal vertical plane of the latter with two pairs of coaxial apertures carrying respectively the auxiliary vertical shafts 3 and 4 with the interposition between each shaft and the corresponding apertures of ball bearings.

The upper section of the hollow upright 1 encloses an electric driving motor 5 of which the shaft 6 extends forwardly through the corresponding transverse wall of the same.

Each of the two auxiliary shafts 3 and 4 is connected at its lower end through a pivotal connection with the corresponding fork-shaped link 21 or 22. Said two links are pivotally connected at their outer ends with a common cylindrical mixer 23 so as to form with the latter a pivotal system to which a rotary and wobbling movement is to be bestowed for the execution of a proper mixing operation. Instead of a worm gear, it is obviously possible to resort to another type of speed-reducing gear constituted by spur wheels.

The operation of the above-described arrangement is as follows: the wormwheel 11 carrying the driving wheel 12, the cage 15 carrying the balls 16, the auxiliary shaft 3, the pivotal system 21, 22, 23, the auxiliary shaft 4 and the chain drive 14, 19, 20 form together a closed kinematic chain. If now the motor 5 is energized, there appears at a predetermined point of it this closed kinematic chain a driving force. This point registers with the wormwheel 11 through which the driving wheel 12 is started rotating. From this driving Wheel 12, the drive is transmitted, on the one hand, through the balls 16 and the cage 15 to the shaft 3 and, on the other hand, through said balls 16, the

, driven ring 13, the chain gear 14, 20, 19 to the shaft 4.

Thus, both auxiliary driving shafts 3 and 4 are started rotating and the pivotal system 21, 22, 23 is constrained to move. The fact that the two shafts 3 and 4 are coupled together through the pivotal system 21, 22, 23 constrains said two shafts to rotate in opposite directions with different angular speeds. This difference in angular speed and direction is compensated by the frictional ball system operating as a compensating gear so that the drive provided by the motor 5 may be performed under constant angular speed conditions.

In the modification illustrated in FIG. 4, the transmissionof movement between the driving ring 12 and the driven ring 13, instead of being provided by balls enclosed inside a cage, is obtained by means of frictional rollers 25 carried by radially extending spindles 26 the inner ends of which are revolvably carried by the superposed sections of an annular flange 27, which sections are keyed to the auxiliary shaft 3.

In the further modification illustrated in FIG. 5, the frictional rollers are replaced by toothed wheels 30 carried in the same manner and meshing with the toothed 3 driving and driven rings 28 and 29 replacing the smooth rings 12 and 13.

What I claim is:

1. An arrangement for bestowing a body with a rotary and wobbling movement comprising a driving motor, a speed-reducing gear driven by said motor, two parallel auxiliary shafts, a driving wheel loosely carried by the auxiliary shaft nearer the driving motor, mechanical means operatively connecting said driving Wheel with the speed-reducing gear, compensating gear means coaxial with the first-mentioned shaft and including two parallel rings of which one is driven by the driving wheel, members running between and engaging said rings and driving said first shaft, a chain wheel driven by the other ring of the compensating gear means and loosely carried by said first-mentioned shaft, a chain operatively connecting said chain wheel with the other auxiliary shaft, and links pivotally connecting opposite ends of the body to be bestowed with movement with the corresponding auxiliary shafts.

2. An arrangement for bestowing a body with a rotary and wobbling movement comprising a driving motor, two parallel auxiliary shafts, a driving wheel loosely carried by the auxiliary shaft nearer the driving motor, a worm gear operatively connecting said driving wheel with the driving motor, a chain wheel loosely carried by the firstmentioned shaft, compensating slip gear means coaxial with the first-mentioned shaft and including a cage keyed to said first-mentioned shaft, balls carried by said cage and projecting beyond the latter in opposite directions parallel with the axis of the shaft, a driving ring and a driven ring surrounding said one shaft and engaging the opposite projecting surfaces of the balls and rigid respectively with the worm wheel and with the chain wheel, a chain operatively connecting said chain wheel with the other auxiliary shaft, and links pivotally connecting opposite ends of the body to be bestowed with movement with the corresponding auxiliary shafts.

3. An arrangement for bestowing a body with a rotary and wobbling movement comprising an upright, a casing carried in overhanging relationship by the upright and including two horizontal Walls provided with two pairs of coaxial ports extending through said walls, a driving motor carried by the upper end of the upright, a speedreducing gear driven by said motor, two parallel auxiliary shafts carried inside the corresponding pairs of ports, a driving wheel loosely carried by the auxiliary shaft nearer the driving motor, mechanical means operatively connecting said driving wheel with the speed-reducing gear, compensating slip gear means coaxial with the first shaft inside the casing and including two parallel rings of which one is driven by the driving wheel, members running between and engaging said rings and driving said first-mentioned shaft, a chain wheel driven by the other ring of the compensating gear means and loosely carried by said firstmentioned shaft, a chain operatively connecting said chain wheel with the other auxiliary shaft, and links pivotally connecting opposite ends of the body to be bestowed with movement with the corresponding auxiliary shafts.

4. An arrangement for bestowing a body with a rotary and wobbling movement comprising an upright, a casing carried in overhanging radial relationship by the upright and including two horizontal walls provided with two pairs of coaxial ports extending through said walls, a pedestal rigid with the upright and extending in parallelism with and underneath the casing, a driving motor carried by the upper end of the upright, a speed-reducing gear driven by said motor, two parallel auxiliary shafts carried inside the corresponding pairs of ports, a driving wheel loosely carried by the auxiliary shaft nearer the driving motor, mechanical means operatively connecting said driving Wheel with the speed-reducing gear, compensating clip gear means coaxial with the first-mentioned shaft and including two parallel rings of which one is driven by the driving wheel, members running between and engaging said rings and driving said first-mentioned shaft, a chain wheel driven by the other ring of the compensating gear means and loosely carried by said first-mentioned shaft, a chain operatively connecting said chain wheel with the other auxiliary shaft, and links pivotally connecting opposite ends of the body to be bestowed with movement with the corresponding auxiliary shafts.

References Cited by the Examiner UNITED STATES PATENTS 2,302,804 11/42 Schatz 259-72 2,383,107 8/45 Cherry et a1 74-798 2,991,657 7/61 Schatz 74-86 X 3,049,019 8/62 La Pointe et al 74-798 X 3,130,604 4/64 Johnson et a1 74-650 BROUGHTON G. DURHAM, Primary Examiner. 

1. AN ARRANGEMENT FOR BESTOWING A BODY WITH A ROTARY AND WOBBLING MOVEMENT COMPRISING A DRIVING MOTOR, A SPEED-REDUCING GEAR DRIVEN BY SAID MOTOR, TWO PARALLEL AUXILIARY SHAFTS, A DRIVING WHEEL LOOSELY CARRIED BY THE AUXILIARY SHAFT NEARER THE DRIVING MOTOR, MECHANICAL MEANS OPERATIVELY CONNECTING SAID DRIVING WHEEL WITH THE SPEED-REDUCING GEAR, COMPENSATING GEAR MEANS COAXIAL WITH THE FIRST-MENTIONED SHAFT AND INCLUDING TWO PARALLEL RINGS OF WHICH ONE IS DRIVEN BY THE DRIVING WHEEL, MEMBERS RUNNING BETWEEN AND ENGAGING SAID RINGS AND DRIVING SAID FIRST SHAFT, A CHAIN WHEEL DRIVEN BY THE OTHER RING OF THE COMPENSATING GEAR MEANS AND LOOSELY CARRIED BY SAID FIRST-MENTIONED SHAFT, A CHAIN OPERATIVELY CONNECTING SAID CHAIN WHEEL WITH THE OTHER AUXILIARY SHAFT, AND LINKS PIVOTALLY CONNECTING OPPOSITE ENDS OF THE BODY TO BE BESTOWED WITH MOVEMENT WITH THE CORRESPONDING AUXILIARY SHAFTS. 